function drawVisualization() {
  // Create and populate the data table.
  var data = google.visualization.arrayToDataTable([
    ['Country', 'Population (mil)', 'Area (km2)'],
    ['CN',            1324,           9640821],
    ['IN',            1133,           3287263],
    ['US',            304,            9629091],
    ['ID',            232,            1904569],
    ['BR',            187,            8514877]
  ]);

  // Create and draw the visualization.
  new google.visualization.IntensityMap(document.getElementById('visualization')).
      draw(data, null);
}
